“Tammy”, the latest big screen comedy from “Mike & Molly” star Melissa McCarthy, is as a film as big a sloppy mess as its main character. It’s a surprisingly unamusing and uninteresting film, especially considering the talent that McCarthy and writer/director Ben Falcone have to work with, and perhaps the best thing that can be said about it is that a scant 96 minutes, it’s mercifully short.